Lung Cancer Explained Clearly by

By Adem Lewis / in , , , , , , , , , , , , , , , , , , , , , , , , , /

so welcome to another MedCram lecture
we’re going to talk about lung cancer today specifically when we talk about
lung cancer it’s important to understand what that means
just because there’s a cancer inside of the lung it doesn’t necessarily more
talking about lung cancer so if you look at the anatomy of the lung you’ll see
the trachea branches into the right upper lobe the middle lobe and then the
lower lobe then you’ve got the left bronchus and that divides into the upper
and lower and they spread out so generally speaking these bronchi they
keep dividing etc it’s these areas that give rise to the cells that cause lung
cancer and that’s what we call it generally speaking we call it
bronchogenic lung cancer so the lung cancer we’re talking about today is
tumors that arise from the bronchus okay there’s a couple of other cancers in
this general area that we’re not going to be talking about so there’s a
covering of the lungs called the mesothelium and that can cause a cancer
and that’s called a mezzo fili oma and that’s almost always associated with
asbestos exposure we’re not going to be talking about that today the other thing
also that you may see is something called a carcinoid which can be in the
bronchus very vascular carcinoid that’s another tumor that arises in the lungs
that we’re not going to talk about today so we’re not to talk about mesothelioma
we’re not going to talk about Carson we’re going to talk about lung cancer
another name for that is bronco genic carcinoma and we’ll talk a little bit
about how that’s divided so bronchogenic carcinoma is what we’re going to talk
about today okay well let’s talk about some statistics that you should know in
terms of epidemiology 2015 in the United States there was
about 220,000 new cases in terms of deaths in 2000 so this was in 2015 in
2012 because we have data going back to that in terms of men and women in terms
of man there were about 87,000 deaths and in women
there was about 71 thousand deaths from lung cancer now in terms of what
direction this is going in for men this is kind of stabilized okay for women
however this is still going up and that’s the concern about what’s going on
if I were to graph this in terms of cancer deaths by site let’s say that
this was lung cancer lung if I were to add up the other types of cancer okay
this would be colon cancer this would be breast cancer and here would be prostate
cancer and in terms of actual numbers this would be around 120,000 and this
would be about 160,000 so just to give you an idea about how many people are
dying every year from lung cancer as opposed to prostate breast or colorectal
should give you the importance of this topic it is the most common cause of
cancer death in the United States and the world you know if you want to talk
about the world in 2012 so this is worldwide and there’s a lot
of smoking that goes on worldwide it’s quite sobering there were 1.8 million
new cases and how many died that year in 2012 1.6 million in terms of lung cancer
incidents looking back from 1975 to 2011 there’s an interesting correlation
that’s occurred between the genders back in 1975 there was many more men that
were smoking than women and that went up and peaked around 1985 or so and since
that time it’s been coming down at that rate and so the peak for that was well
back in terms of men back in 1985 in terms of women however that seems to not
have plateaued as as early that plateau period seems to have been just before
2000 and it seems to be coming down just very very slowly so the interesting
thing here is is that men are still above women in terms of incidents but
they seem to be coming down at a faster rate than the lung cancer incidents in
women and we think that that’s just a little bit of a lag time there you know
in terms of causes now the number one cause of lung cancer is still active
smoking and they figure that’s about 90% so what’s the other 10% well it’s
possible that this may actually add up to more than a hundred percent because
there’s usually multiple things that’s doing it but believe it or not radon
which is a gas that’s found in the soil and cause about 9 to 15 percent of lung
cancer number three is Occupational and number
four is environmental so basically air pollution occupational
accounts for about 10% environmental about one to two percent let’s talk a
little bit about the pathophysiology of this so if you’ve got the bronchus
coming here typically what’s going to happen is you’re going to get some sort
of irritant coming down into the lungs and these air Tain’s consent them go
into the cells and cause problems and as these cells are dividing something can
happen where the breaks on the cellular division are removed and the cellular
division just continues to divide and divide and so you start to get a tumor
and the tumor grows and you have doubling times and usually it’s very
small you cannot pick it up on an x-ray maybe you can pick it up on a CT scan if
it’s big enough but this is generally where the tumor size is going to enlarge
until it’s finally picked up and this is the reason why we call it bronco genic
carcinoma now interesting we’ll talk about this later
there are types of lung cancer that are specifically associated with smoking and
the two that you should know and we’ll review this later is squamous cell and
small cell and it’s very interesting to note that when you look at the anatomy
of the lungs that squamous and small cell lung cancer generally are centrally
located and one can think and say that this may be related to the
the smoke when it comes down it’s going to have its strongest effect effect
centrally as opposed to peripherally there are some cancers which are more
common peripherally and those are not associated with smoking but small-cell
is one of them and squamous cell is the other okay well join us for our next
lecture we’re going to talk a little bit about screening and staging thank you so
much you

24 thoughts on “Lung Cancer Explained Clearly by

  1. Hi sir you are really great don't know how much these video are helping..thank you for making my concepts in medicine better 🙂

  2. Hello Doctor, i am 15 years old and i am studying lung cancer. I must say, that video is really great and all of us appreciate it, thank you.

  3. recently i caugh a lot and blood comes out sometimes
    i have pain in my upper back always and sometimes in the chest
    sometimes i find it hard to breath ; when i clime a hill or go up the stairs
    and i get a headech every now and then
    and ive been smoking for about 10 years now
    are these enought to do a cancer scan ?

  4. This is what happens when you either smoke or you have exposure just something you were never designed to be able to handle. Exposed for long enough and you'll start having problems

  5. No offense, Doctor Seheult, but isn't it possible that the increase in the "occupational" causes of a new, primary cancer (e.g. lung caner) in women, as differentiated from the original cancer (e.g. ovarian cancer), could refer to, and could originate from the practice of, the "occupation" of the doctors who recommend treating the original cancer with carcinogenic chemotherapy (as well as the "occupation" of the nurses or technicians who administer it), and not to the occupations of the women who are treated with carcinogenic chemotherapy in arresting the original cancer in the first place? This has happened to my wife. And I cannot help but notice that the vast majority of the women under chemotherapy treatment at the same time as my wife are women. I mean, it's like 99% to 1%. Just wondering.

  6. Hello sir…I really like ur videos ..the way of explanation..u r doing a really good job…May God bless you…😊

  7. my father is diagnosed with non-small cell adenocarcinoma of lung is there permenant cure or if not the how much life expectancy bcoz google says only five years is it true???

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